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The following 2 entries include the term methylmalonic.
methylmalonic acid
noun: a structural isomer of succinic acid present in minute amounts in healthy human urine but excreted in large quantities in the urine of individuals with a vitamin B12 deficiency
methylmalonic aciduria
noun: a metabolic defect which is controlled by an autosomal recessive gene and in which methylmalonic acid is not converted to succinic acid with chronic metabolic acidosis resulting
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Merriam-Webster unabridged
